Not necessary to
John Doty (email@example.com)
Date: December 13, 1994
Original source: Usenet's rec.radio.shortwave
a coax, do I need to balance the wire with the coax, otherwise
I'll loose signal?
thinking about maximizing signal strength, but the real issue
is always signal to noise ratio. Getting rid of the coax will
indeed increase signal levels, but it will in most instances increase
the noise even more, so it's a net loss.
There is no need to balance a coax-fed antenna as long as the
coaxial shield is well grounded. You will lose signal due to the
impedance mismatch between the wire and the coax, but this is
generally not a major difficulty except possibly at a few "antiresonant"
Antiresonance declines in importance (and frequency) as the antenna
is lengthened. You can also use a matching transformer between
the antenna and the coax to supress antiresonance.